Machine for making insulating-tubes.



.B. HABIE'ELY. MACHINE FOR MAKING INSULATING TUBES.

APIiLIOA'I'ION FILED MAY 2, 1908.

I PATENTED JUL Y Q 1907.

2 SHEETS-SHEET 1.

INVENTOR No. 858.451. PATENTED JULY-2, 1907.

B. HAEFELY. MACHINE FOR MAKING INSULATING TUBES.

APPLICATION FILED MAY 2, 1908.

' 2 SHEETS-SHEET 2.

WITNESSES: S INVENTORI ATTORNEY UNITED STATES PATENT OFFICE MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

, L MACHINE FQRMAKING INSULATING-Tunas.

' To all whom it may concern:

' ing tubes and it constitutes an improvement upon the Be it known that l, EMIL Hanrnw, acitizen of the Republic of Switzerland, and a resident of Basel, in Switzerland, have invented a new and useful Improvement in Machines for Making Insulating-Tubes, of which the following is a specification, I

My invention relates to machines for making insulatmachine set forth and claimed in my application Serial No. 223,442, filed September 26, 19.04.

The object of my invention is to provide means for insuring the feeding of insulating fabric, such as paper to a winding mandrel in such manner as to avoid all irregularities in such material and thus tend to insure the production of tubes of uniform dimensions and homogeneous composition.

In the accompanying drawing, Figure l is a view, partially in side elevation and partially in section, of a machine embodying my invention, and Fig. 2 is a front elevation of a portion of the machine shown in Fig. 1.

Mounted in a suitable frame A is a mandrel holder a the surface of which is provided with eight longitudinal recesses which and angular or substantially V shape in cross-section and which extend the entire length of the holder parallel to its axis and are designated by the letters b b, the recesses b being of the same shape'and dimensions as the recesses 12 but alternating in position therewith. The interior of the mandrel holder a communicates with the exterior by means: of passages c which are uniformly spaced and the outer endsof which terminate in the recesses b. The recesses b, any one of which may be utilized for holding a mandrel, have polished surfaces, while the surfaces of the recesses b may be unfinished. Any suitable means may be employed for locking the mandrel holder in the position to which it is rotatively adjusted. A gas pipe d extends through the'interior of the mandrel holder a and is supported in the ends thereof, suitable connections being made to one end'thereof by means of a supply hose not shown). The pipe d is provided with small branch tubes s having lateral openings e. Above the mandrel holder a, is located a pressure device f, which is rotatively' adjustable and is provided with a plurality of longitudinal ribs or flanges F, F, F and F the edges of which are-slightly chamfered or beveled in order that the material may not be injured as it is wound rpm the mandrel. The pressure device f is supported,

oy a dross bar t which is free to move vertically in guides provided in the standards T of the frame A, suitable gearing being provided for raising the said cross bar when the pressure device is not in use.

A roll of paper or other fabric which constitutes one of the principal elements of my product is supported in Specification of Letters Patent. I Application filed May 2,1906- Serial No. 314,910.

Patented July 2, 1907.

suitable bearings in the frame A, as indicated at V, and the paper drawn therefrom passes over a tension roller g, a guide roller h and a table i to a mandrel n of the proper size which rests in the upper recess b of the mandrel holder. On account of the tendency of the paper or other fabric to stretch more at the edges than at the intermediate portions of the sheet, I provide the frame A with a bar B having a curved upper surface and fasten its ends to the frame between the table 1 and the mandrel. Beneath approximately thomiddle point of the bar ll, I locate a screw B, by means of which the bar may be bowed upwardly between its ends a suflicient amount to compensate for the difference in elongation between the edges and the intermediate portions of the fabric. As the paper or other fabric is drawn frpm the roll V over the table '5, it is provided with a editing of varnish or other suitable binder and the free is wound close around the mandrel, after which the mandrel is rotated at the speed desired, either mechanically or by hand, in a clockwise direction, so as to apply the fabric with the varnish coating between successive layers. As soon as a single layer of material is wound upon the mandrel and the latter is placed in the recess b, the pressure device f is lowered until the entire weight of it and the bar t rests upon the matcripl on the mandrelr Inasmuch as the recess b is of angular or V shape in cross-section and the pressure exerted from above is uniform and constant, the progressively increasing diameter of the tube, as it is formed, does not effect any variation in the degree of density of the material.

While the device manufactured by my machine may consist solely of paper or other suitable fabric and p varnish, I prefer to combine mica therewith, and, when so combined, thin sheets of mica are placed upon the coating of varnish as it passes to the mandrel. For the purpose of supporting the sheets of mica as they are fed to the mandrel, I may provide the frame A with a guide consistency and without air bubbles or other particles which ,might serve .to impair the quality of the insulatirig' tube when completed. On account of the continuously applied uniform pressure, no varnish in excess of the amount required'as a can remain upon the,

fabric as it is wound upontlie mandrel and'a tube of absolute uniformity as to consistency and dimensions and having extraordinary insulating qual' ies and durability istherefore produced.

claim as my invention:

1. In a machine for making tubes from sheet material. the combination with a frame. of a mandrel, a mandrel holder, a pressure device, a compensating member having a surface which the sheet material engages as it is fed to the mandrel, and means for producing such longitudinal curvature of said surface as may be desired.

2. in a machine for making tubes from sheet material. the combination with a frame, of a mandrel, a mandrel holder, apressure device, a compensating bar having its ends fastened to the frame in front of the mandrel holder and means for raising and lowering the middle portion of said bar.

holder, a pressure device, and a compensating device com- I prising a bar of curved cross-section fastened at its ends to the frame and a screw for raising and lowering the middle of the bar.

In testimony whereof. I have hereunto subscribed my name this 30th day of April, 1906.

mun imnnnny.

Witnesses 2 1 Wnsnsr G. CARR,

1311mm I'IINES. 

